I’m having a strange issue when I activate Advanced Custom Fields that causes a server error when I try to access the taxonomy and user settings pages. When it’s deactivated, the pages work.
Pages in question
http://exampledomain.com//wp-admin/edit-tags.php?taxonomy=category or any custom tax I’ve created
Any ideas why this may happen?
Are you able to turn on DEBUG MODE in your wp-config.php file and reload the page. Is any error message shown?
It is possible that the error is caused by the page taking too long to load. What if any fields have you added to the user / taxonomy page?
This reply has been marked as private.
Are you able to deactivate all other plugins / change to default theme.
I understand that ACF is causing the issue, but perhaps it is not the root of the problem. Perhaps the problem comes from another plugin and then ACF trips up.
I switched to Twenty Thirteen and only have ACF activated. This is the error I get
[17-Sep-2013 13:12:29] PHP Fatal error: Call to undefined function filter_var() in /var/www/hlacharterschool.org/wp-install/wp-content/plugins/advanced-custom-fields/core/controllers/everything_fields.php on line 266
[17-Sep-2013 13:12:29] PHP Notice: ob_end_flush() [ref.outcontrol]: failed to delete buffer zlib output compression. in /var/www/hlacharterschool.org/wp-install/wp-includes/functions.php on line 2765
Looking at the PHP docs,
This is a function as of PHP 5.2.0
Perhaps you will need to upgrade the PHP version running on the server?
I figured out that this happens when “filter” php module is off. I turned it on and problem was fixed.